With a net worth of $17.2 billion, Fidelity Investments’s Abigail Johnson is by far the wealthiest person in Massachusetts, and number 23 on Forbes’s list of the 400 richest Americans. That’s a lot of mutual fund fees.

Johnson, who now runs Fidelity Financial Services, is the likely successor to her father, Edward Johnson III. At 83, “Ned” remains the Boston company’s chief executive, scraping by on a mere $9.3 billion.

For most people, even imagining that kind of money is difficult. To make it easier, here are some ways to help you comprehend a $17.2 billion portfolio: